Pol Pot was an atheist

Yes, it is true that Pol Pot was an atheist, but that did not make him a bad person, or influence him to make bad decisions.
Atheism is only the disbelief in God, not the belief in any dogma or rules. This means that Atheism is not a reason to kill, not for Pol Pot nor anyone. He can justifiably be accused of being a terrible human being, but his atheism, as a simple lack of belief, cannot be blamed for it.